reimplement agent,provider and add file history

internal/llm/provider/gemini.go

@@ -4,81 +4,69 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"time"
 
 	"github.com/google/generative-ai-go/genai"
 	"github.com/google/uuid"
-	"github.com/kujtimiihoxha/termai/internal/llm/models"
+	"github.com/kujtimiihoxha/termai/internal/config"
 	"github.com/kujtimiihoxha/termai/internal/llm/tools"
+	"github.com/kujtimiihoxha/termai/internal/logging"
 	"github.com/kujtimiihoxha/termai/internal/message"
 	"google.golang.org/api/iterator"
 	"google.golang.org/api/option"
 )
 
-type geminiProvider struct {
-	client        *genai.Client
-	model         models.Model
-	maxTokens     int32
-	apiKey        string
-	systemMessage string
+type geminiOptions struct {
+	disableCache bool
 }
 
-type GeminiOption func(*geminiProvider)
+type GeminiOption func(*geminiOptions)
 
-func NewGeminiProvider(ctx context.Context, opts ...GeminiOption) (Provider, error) {
-	provider := &geminiProvider{
-		maxTokens: 5000,
+type geminiClient struct {
+	providerOptions providerClientOptions
+	options         geminiOptions
+	client          *genai.Client
+}
+
+type GeminiClient ProviderClient
+
+func newGeminiClient(opts providerClientOptions) GeminiClient {
+	geminiOpts := geminiOptions{}
+	for _, o := range opts.geminiOptions {
+		o(&geminiOpts)
 	}
 
-	for _, opt := range opts {
-		opt(provider)
-	}
-
-	if provider.systemMessage == "" {
-		return nil, errors.New("system message is required")
-	}
-
-	client, err := genai.NewClient(ctx, option.WithAPIKey(provider.apiKey))
+	client, err := genai.NewClient(context.Background(), option.WithAPIKey(opts.apiKey))
 	if err != nil {
-		return nil, err
+		logging.Error("Failed to create Gemini client", "error", err)
+		return nil
 	}
-	provider.client = client
 
-	return provider, nil
-}
-
-func WithGeminiSystemMessage(message string) GeminiOption {
-	return func(p *geminiProvider) {
-		p.systemMessage = message
+	return &geminiClient{
+		providerOptions: opts,
+		options:         geminiOpts,
+		client:          client,
 	}
 }
 
-func WithGeminiMaxTokens(maxTokens int32) GeminiOption {
-	return func(p *geminiProvider) {
-		p.maxTokens = maxTokens
-	}
-}
-
-func WithGeminiModel(model models.Model) GeminiOption {
-	return func(p *geminiProvider) {
-		p.model = model
-	}
-}
-
-func WithGeminiKey(apiKey string) GeminiOption {
-	return func(p *geminiProvider) {
-		p.apiKey = apiKey
-	}
-}
-
-func (p *geminiProvider) Close() {
-	if p.client != nil {
-		p.client.Close()
-	}
-}
-
-func (p *geminiProvider) convertToGeminiHistory(messages []message.Message) []*genai.Content {
+func (g *geminiClient) convertMessages(messages []message.Message) []*genai.Content {
 	var history []*genai.Content
 
+	// Add system message first
+	history = append(history, &genai.Content{
+		Parts: []genai.Part{genai.Text(g.providerOptions.systemMessage)},
+		Role:  "user",
+	})
+
+	// Add a system response to acknowledge the system message
+	history = append(history, &genai.Content{
+		Parts: []genai.Part{genai.Text("I'll help you with that.")},
+		Role:  "model",
+	})
+
 	for _, msg := range messages {
 		switch msg.Role {
 		case message.User:
@@ -86,6 +74,7 @@ func (p *geminiProvider) convertToGeminiHistory(messages []message.Message) []*g
 				Parts: []genai.Part{genai.Text(msg.Content().String())},
 				Role:  "user",
 			})
+
 		case message.Assistant:
 			content := &genai.Content{
 				Role:  "model",
@@ -107,6 +96,7 @@ func (p *geminiProvider) convertToGeminiHistory(messages []message.Message) []*g
 			}
 
 			history = append(history, content)
+
 		case message.Tool:
 			for _, result := range msg.ToolResults() {
 				response := map[string]interface{}{"result": result.Content}
@@ -114,10 +104,11 @@ func (p *geminiProvider) convertToGeminiHistory(messages []message.Message) []*g
 				if err == nil {
 					response = parsed
 				}
+
 				var toolCall message.ToolCall
-				for _, msg := range messages {
-					if msg.Role == message.Assistant {
-						for _, call := range msg.ToolCalls() {
+				for _, m := range messages {
+					if m.Role == message.Assistant {
+						for _, call := range m.ToolCalls() {
 							if call.ID == result.ToolCallID {
 								toolCall = call
 								break
@@ -140,7 +131,335 @@ func (p *geminiProvider) convertToGeminiHistory(messages []message.Message) []*g
 	return history
 }
 
-func (p *geminiProvider) extractTokenUsage(resp *genai.GenerateContentResponse) TokenUsage {
+func (g *geminiClient) convertTools(tools []tools.BaseTool) []*genai.Tool {
+	geminiTools := make([]*genai.Tool, 0, len(tools))
+
+	for _, tool := range tools {
+		info := tool.Info()
+		declaration := &genai.FunctionDeclaration{
+			Name:        info.Name,
+			Description: info.Description,
+			Parameters: &genai.Schema{
+				Type:       genai.TypeObject,
+				Properties: convertSchemaProperties(info.Parameters),
+				Required:   info.Required,
+			},
+		}
+
+		geminiTools = append(geminiTools, &genai.Tool{
+			FunctionDeclarations: []*genai.FunctionDeclaration{declaration},
+		})
+	}
+
+	return geminiTools
+}
+
+func (g *geminiClient) finishReason(reason genai.FinishReason) message.FinishReason {
+	reasonStr := reason.String()
+	switch {
+	case reasonStr == "STOP":
+		return message.FinishReasonEndTurn
+	case reasonStr == "MAX_TOKENS":
+		return message.FinishReasonMaxTokens
+	case strings.Contains(reasonStr, "FUNCTION") || strings.Contains(reasonStr, "TOOL"):
+		return message.FinishReasonToolUse
+	default:
+		return message.FinishReasonUnknown
+	}
+}
+
+func (g *geminiClient) send(ctx context.Context, messages []message.Message, tools []tools.BaseTool) (*ProviderResponse, error) {
+	model := g.client.GenerativeModel(g.providerOptions.model.APIModel)
+	model.SetMaxOutputTokens(int32(g.providerOptions.maxTokens))
+
+	// Convert tools
+	if len(tools) > 0 {
+		model.Tools = g.convertTools(tools)
+	}
+
+	// Convert messages
+	geminiMessages := g.convertMessages(messages)
+
+	cfg := config.Get()
+	if cfg.Debug {
+		jsonData, _ := json.Marshal(geminiMessages)
+		logging.Debug("Prepared messages", "messages", string(jsonData))
+	}
+
+	attempts := 0
+	for {
+		attempts++
+		chat := model.StartChat()
+		chat.History = geminiMessages[:len(geminiMessages)-1] // All but last message
+
+		lastMsg := geminiMessages[len(geminiMessages)-1]
+		var lastText string
+		for _, part := range lastMsg.Parts {
+			if text, ok := part.(genai.Text); ok {
+				lastText = string(text)
+				break
+			}
+		}
+
+		resp, err := chat.SendMessage(ctx, genai.Text(lastText))
+		// If there is an error we are going to see if we can retry the call
+		if err != nil {
+			retry, after, retryErr := g.shouldRetry(attempts, err)
+			if retryErr != nil {
+				return nil, retryErr
+			}
+			if retry {
+				logging.WarnPersist("Retrying due to rate limit... attempt %d of %d", logging.PersistTimeArg, time.Millisecond*time.Duration(after+100))
+				select {
+				case <-ctx.Done():
+					return nil, ctx.Err()
+				case <-time.After(time.Duration(after) * time.Millisecond):
+					continue
+				}
+			}
+			return nil, retryErr
+		}
+
+		content := ""
+		var toolCalls []message.ToolCall
+
+		if len(resp.Candidates) > 0 && resp.Candidates[0].Content != nil {
+			for _, part := range resp.Candidates[0].Content.Parts {
+				switch p := part.(type) {
+				case genai.Text:
+					content = string(p)
+				case genai.FunctionCall:
+					id := "call_" + uuid.New().String()
+					args, _ := json.Marshal(p.Args)
+					toolCalls = append(toolCalls, message.ToolCall{
+						ID:    id,
+						Name:  p.Name,
+						Input: string(args),
+						Type:  "function",
+					})
+				}
+			}
+		}
+
+		return &ProviderResponse{
+			Content:      content,
+			ToolCalls:    toolCalls,
+			Usage:        g.usage(resp),
+			FinishReason: g.finishReason(resp.Candidates[0].FinishReason),
+		}, nil
+	}
+}
+
+func (g *geminiClient) stream(ctx context.Context, messages []message.Message, tools []tools.BaseTool) <-chan ProviderEvent {
+	model := g.client.GenerativeModel(g.providerOptions.model.APIModel)
+	model.SetMaxOutputTokens(int32(g.providerOptions.maxTokens))
+
+	// Convert tools
+	if len(tools) > 0 {
+		model.Tools = g.convertTools(tools)
+	}
+
+	// Convert messages
+	geminiMessages := g.convertMessages(messages)
+
+	cfg := config.Get()
+	if cfg.Debug {
+		jsonData, _ := json.Marshal(geminiMessages)
+		logging.Debug("Prepared messages", "messages", string(jsonData))
+	}
+
+	attempts := 0
+	eventChan := make(chan ProviderEvent)
+
+	go func() {
+		defer close(eventChan)
+
+		for {
+			attempts++
+			chat := model.StartChat()
+			chat.History = geminiMessages[:len(geminiMessages)-1] // All but last message
+
+			lastMsg := geminiMessages[len(geminiMessages)-1]
+			var lastText string
+			for _, part := range lastMsg.Parts {
+				if text, ok := part.(genai.Text); ok {
+					lastText = string(text)
+					break
+				}
+			}
+
+			iter := chat.SendMessageStream(ctx, genai.Text(lastText))
+
+			currentContent := ""
+			toolCalls := []message.ToolCall{}
+			var finalResp *genai.GenerateContentResponse
+
+			eventChan <- ProviderEvent{Type: EventContentStart}
+
+			for {
+				resp, err := iter.Next()
+				if err == iterator.Done {
+					break
+				}
+				if err != nil {
+					retry, after, retryErr := g.shouldRetry(attempts, err)
+					if retryErr != nil {
+						eventChan <- ProviderEvent{Type: EventError, Error: retryErr}
+						return
+					}
+					if retry {
+						logging.WarnPersist("Retrying due to rate limit... attempt %d of %d", logging.PersistTimeArg, time.Millisecond*time.Duration(after+100))
+						select {
+						case <-ctx.Done():
+							if ctx.Err() != nil {
+								eventChan <- ProviderEvent{Type: EventError, Error: ctx.Err()}
+							}
+
+							return
+						case <-time.After(time.Duration(after) * time.Millisecond):
+							break
+						}
+					} else {
+						eventChan <- ProviderEvent{Type: EventError, Error: err}
+						return
+					}
+				}
+
+				finalResp = resp
+
+				if len(resp.Candidates) > 0 && resp.Candidates[0].Content != nil {
+					for _, part := range resp.Candidates[0].Content.Parts {
+						switch p := part.(type) {
+						case genai.Text:
+							newText := string(p)
+							delta := newText[len(currentContent):]
+							if delta != "" {
+								eventChan <- ProviderEvent{
+									Type:    EventContentDelta,
+									Content: delta,
+								}
+								currentContent = newText
+							}
+						case genai.FunctionCall:
+							id := "call_" + uuid.New().String()
+							args, _ := json.Marshal(p.Args)
+							newCall := message.ToolCall{
+								ID:    id,
+								Name:  p.Name,
+								Input: string(args),
+								Type:  "function",
+							}
+
+							isNew := true
+							for _, existing := range toolCalls {
+								if existing.Name == newCall.Name && existing.Input == newCall.Input {
+									isNew = false
+									break
+								}
+							}
+
+							if isNew {
+								toolCalls = append(toolCalls, newCall)
+							}
+						}
+					}
+				}
+			}
+
+			eventChan <- ProviderEvent{Type: EventContentStop}
+
+			if finalResp != nil {
+				eventChan <- ProviderEvent{
+					Type: EventComplete,
+					Response: &ProviderResponse{
+						Content:      currentContent,
+						ToolCalls:    toolCalls,
+						Usage:        g.usage(finalResp),
+						FinishReason: g.finishReason(finalResp.Candidates[0].FinishReason),
+					},
+				}
+				return
+			}
+
+			// If we get here, we need to retry
+			if attempts > maxRetries {
+				eventChan <- ProviderEvent{
+					Type:  EventError,
+					Error: fmt.Errorf("maximum retry attempts reached: %d retries", maxRetries),
+				}
+				return
+			}
+
+			// Wait before retrying
+			select {
+			case <-ctx.Done():
+				if ctx.Err() != nil {
+					eventChan <- ProviderEvent{Type: EventError, Error: ctx.Err()}
+				}
+				return
+			case <-time.After(time.Duration(2000*(1<<(attempts-1))) * time.Millisecond):
+				continue
+			}
+		}
+	}()
+
+	return eventChan
+}
+
+func (g *geminiClient) shouldRetry(attempts int, err error) (bool, int64, error) {
+	// Check if error is a rate limit error
+	if attempts > maxRetries {
+		return false, 0, fmt.Errorf("maximum retry attempts reached for rate limit: %d retries", maxRetries)
+	}
+
+	// Gemini doesn't have a standard error type we can check against
+	// So we'll check the error message for rate limit indicators
+	if errors.Is(err, io.EOF) {
+		return false, 0, err
+	}
+
+	errMsg := err.Error()
+	isRateLimit := false
+
+	// Check for common rate limit error messages
+	if contains(errMsg, "rate limit", "quota exceeded", "too many requests") {
+		isRateLimit = true
+	}
+
+	if !isRateLimit {
+		return false, 0, err
+	}
+
+	// Calculate backoff with jitter
+	backoffMs := 2000 * (1 << (attempts - 1))
+	jitterMs := int(float64(backoffMs) * 0.2)
+	retryMs := backoffMs + jitterMs
+
+	return true, int64(retryMs), nil
+}
+
+func (g *geminiClient) toolCalls(resp *genai.GenerateContentResponse) []message.ToolCall {
+	var toolCalls []message.ToolCall
+
+	if len(resp.Candidates) > 0 && resp.Candidates[0].Content != nil {
+		for _, part := range resp.Candidates[0].Content.Parts {
+			if funcCall, ok := part.(genai.FunctionCall); ok {
+				id := "call_" + uuid.New().String()
+				args, _ := json.Marshal(funcCall.Args)
+				toolCalls = append(toolCalls, message.ToolCall{
+					ID:    id,
+					Name:  funcCall.Name,
+					Input: string(args),
+					Type:  "function",
+				})
+			}
+		}
+	}
+
+	return toolCalls
+}
+
+func (g *geminiClient) usage(resp *genai.GenerateContentResponse) TokenUsage {
 	if resp == nil || resp.UsageMetadata == nil {
 		return TokenUsage{}
 	}
@@ -153,173 +472,17 @@ func (p *geminiProvider) extractTokenUsage(resp *genai.GenerateContentResponse)
 	}
 }
 
-func (p *geminiProvider) SendMessages(ctx context.Context, messages []message.Message, tools []tools.BaseTool) (*ProviderResponse, error) {
-	messages = cleanupMessages(messages)
-	model := p.client.GenerativeModel(p.model.APIModel)
-	model.SetMaxOutputTokens(p.maxTokens)
-
-	model.SystemInstruction = genai.NewUserContent(genai.Text(p.systemMessage))
-
-	if len(tools) > 0 {
-		declarations := p.convertToolsToGeminiFunctionDeclarations(tools)
-		for _, declaration := range declarations {
-			model.Tools = append(model.Tools, &genai.Tool{FunctionDeclarations: []*genai.FunctionDeclaration{declaration}})
-		}
+func WithGeminiDisableCache() GeminiOption {
+	return func(options *geminiOptions) {
+		options.disableCache = true
 	}
-
-	chat := model.StartChat()
-	chat.History = p.convertToGeminiHistory(messages[:len(messages)-1]) // Exclude last message
-
-	lastUserMsg := messages[len(messages)-1]
-	resp, err := chat.SendMessage(ctx, genai.Text(lastUserMsg.Content().String()))
-	if err != nil {
-		return nil, err
-	}
-
-	var content string
-	var toolCalls []message.ToolCall
-
-	if len(resp.Candidates) > 0 && resp.Candidates[0].Content != nil {
-		for _, part := range resp.Candidates[0].Content.Parts {
-			switch p := part.(type) {
-			case genai.Text:
-				content = string(p)
-			case genai.FunctionCall:
-				id := "call_" + uuid.New().String()
-				args, _ := json.Marshal(p.Args)
-				toolCalls = append(toolCalls, message.ToolCall{
-					ID:    id,
-					Name:  p.Name,
-					Input: string(args),
-					Type:  "function",
-				})
-			}
-		}
-	}
-
-	tokenUsage := p.extractTokenUsage(resp)
-
-	return &ProviderResponse{
-		Content:   content,
-		ToolCalls: toolCalls,
-		Usage:     tokenUsage,
-	}, nil
 }
 
-func (p *geminiProvider) StreamResponse(ctx context.Context, messages []message.Message, tools []tools.BaseTool) (<-chan ProviderEvent, error) {
-	messages = cleanupMessages(messages)
-	model := p.client.GenerativeModel(p.model.APIModel)
-	model.SetMaxOutputTokens(p.maxTokens)
-
-	model.SystemInstruction = genai.NewUserContent(genai.Text(p.systemMessage))
-
-	if len(tools) > 0 {
-		declarations := p.convertToolsToGeminiFunctionDeclarations(tools)
-		for _, declaration := range declarations {
-			model.Tools = append(model.Tools, &genai.Tool{FunctionDeclarations: []*genai.FunctionDeclaration{declaration}})
-		}
-	}
-
-	chat := model.StartChat()
-	chat.History = p.convertToGeminiHistory(messages[:len(messages)-1]) // Exclude last message
-
-	lastUserMsg := messages[len(messages)-1]
-
-	iter := chat.SendMessageStream(ctx, genai.Text(lastUserMsg.Content().String()))
-
-	eventChan := make(chan ProviderEvent)
-
-	go func() {
-		defer close(eventChan)
-
-		var finalResp *genai.GenerateContentResponse
-		currentContent := ""
-		toolCalls := []message.ToolCall{}
-
-		for {
-			resp, err := iter.Next()
-			if err == iterator.Done {
-				break
-			}
-			if err != nil {
-				eventChan <- ProviderEvent{
-					Type:  EventError,
-					Error: err,
-				}
-				return
-			}
-
-			finalResp = resp
-
-			if len(resp.Candidates) > 0 && resp.Candidates[0].Content != nil {
-				for _, part := range resp.Candidates[0].Content.Parts {
-					switch p := part.(type) {
-					case genai.Text:
-						newText := string(p)
-						eventChan <- ProviderEvent{
-							Type:    EventContentDelta,
-							Content: newText,
-						}
-						currentContent += newText
-					case genai.FunctionCall:
-						id := "call_" + uuid.New().String()
-						args, _ := json.Marshal(p.Args)
-						newCall := message.ToolCall{
-							ID:    id,
-							Name:  p.Name,
-							Input: string(args),
-							Type:  "function",
-						}
-
-						isNew := true
-						for _, existing := range toolCalls {
-							if existing.Name == newCall.Name && existing.Input == newCall.Input {
-								isNew = false
-								break
-							}
-						}
-
-						if isNew {
-							toolCalls = append(toolCalls, newCall)
-						}
-					}
-				}
-			}
-		}
-
-		tokenUsage := p.extractTokenUsage(finalResp)
-
-		eventChan <- ProviderEvent{
-			Type: EventComplete,
-			Response: &ProviderResponse{
-				Content:      currentContent,
-				ToolCalls:    toolCalls,
-				Usage:        tokenUsage,
-				FinishReason: string(finalResp.Candidates[0].FinishReason.String()),
-			},
-		}
-	}()
-
-	return eventChan, nil
-}
-
-func (p *geminiProvider) convertToolsToGeminiFunctionDeclarations(tools []tools.BaseTool) []*genai.FunctionDeclaration {
-	declarations := make([]*genai.FunctionDeclaration, len(tools))
-
-	for i, tool := range tools {
-		info := tool.Info()
-		declarations[i] = &genai.FunctionDeclaration{
-			Name:        info.Name,
-			Description: info.Description,
-			Parameters: &genai.Schema{
-				Type:       genai.TypeObject,
-				Properties: convertSchemaProperties(info.Parameters),
-				Required:   info.Required,
-			},
-		}
-	}
-
-	return declarations
+// Helper functions
+func parseJsonToMap(jsonStr string) (map[string]interface{}, error) {
+	var result map[string]interface{}
+	err := json.Unmarshal([]byte(jsonStr), &result)
+	return result, err
 }
 
 func convertSchemaProperties(parameters map[string]interface{}) map[string]*genai.Schema {
@@ -396,8 +559,12 @@ func mapJSONTypeToGenAI(jsonType string) genai.Type {
 	}
 }
 
-func parseJsonToMap(jsonStr string) (map[string]interface{}, error) {
-	var result map[string]interface{}
-	err := json.Unmarshal([]byte(jsonStr), &result)
-	return result, err
+func contains(s string, substrs ...string) bool {
+	for _, substr := range substrs {
+		if strings.Contains(strings.ToLower(s), strings.ToLower(substr)) {
+			return true
+		}
+	}
+	return false
 }
+